Adjusting-screw lock for slidable jaw wrenches



Aug. 31, 1954 s. w. PUGH ADJUSTING-SCREW LOOK FOR SLIDABLE JAW WRENCHE SRiled Dec. 20, 1951 Patented Aug. 31, 1954 ADJUSTING-SCREW LOOK FORSLIDABLE JAW WRENCHES Stanford W. Pugh, Independence, Kans. ApplicationDecember 20, 1951, Serial No. 262,545 3 Claims. 81- 165) This inventionrelates to adjustable wrenches and has for its principal objectproviding a Figure 2 is a fragmentary top plan view of.

the wrench head shown in Figure 1.

Figure 3 is a fragmentary side elevation of the head of the wrench withportions broken away Figure 4 is a side elevation of the locking, pin.

Figure 5 is a cross-sectional view of a modified worm gear showing thelocking device inoperative position.

cut into the body of the locking pin midway between its ends. Theshoulder 2| is not cut at a of the locking pin l8. Instead, the shoulderis cut at an angle differing from the right angle 2 position by about10, although the angle may vary substantially.

The head of the wrench is provided with a cylindrical bore 22 in whichthe body of the looking pin I8 rotates. The head H is also provided withan inwardly threaded bore 23 in which the inner end of the locking pinl8 may be threaded.

In operation, the locking pin, disposed in bores 22, 23, and 24, iswithdrawn along its threads 20 so that the shoulder 2| does not contactthe end of worm ll. shaft of the locking pin between shoulder 2| andthreads 20, moving the rack I4 and its integral jaw l3 to the desiredposition.

The locking pin is then rotated so that shoulder 2| is pressed tightlyagainst worm H, as

in Figure 3. Suflicrent pressure is, applied to the and worm l7. Inorder to release the worm, it is merely necessary to reverse therotation of the locking pin, removing the shoulder 2| from its bearingagainst the worm. In Figure 5 is shown another form of my locking devicein which the locking pin 25 is provided with a taper 26. The worm 21 isprovided with and worm axis and forced against each other when the pinis rotated in one direction to frictionally lock the worm againstrotation.

2. An adjustable wrench according to claim 1 wherein one of saidengageable surfaces forms a shoulder bearing carried by and inclined tothe longitudinal axis of the pin and the other of said surfaces forms ashoulder bearing on an end of the worm.

3. Andjustable wrench according to claim 1 wherein one of saidengageable surfaces comprises a tapered shoulder on said locking pinsurrounding its axis and arranged-to-bear against the other surface.

References Cited in the file of this patent UNITED STATES PATENTS Number

